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In the good old days I was standing in a queue in a shop selling electrical supplies and overheard a conversation between the manager and another customer. The customer seemed to be unsure about extending a lighting circuit. The manager "there are only 3 faults - the light will not switch off...

Presumably "dodgy electrical work" is likely to be of a sort where problems come to light very quickly (ie, the house burns down with the electrician still in it). How many are likely to be where the work was left apparently trouble free to begin with but bites back after several years?

There does seem to be a difference in attitude between electricians I have met socially and those posting here.

And how does water in a toilet bowl get its earth? (Or in plastic bath for that matter...)

It is permitted for diyers to replace faulty sections of cable, replace faceplates and lights, and add extra lights or spurs in certain rooms without notification. The provision that it must be safe is covered and acknowledges that there are people that know the difference between red & black or...

I have just found this http://www.idhee.org.uk/calculator.html This is talking about cycling that occurs when there is no demand but the request to the boiler has not been cancelled. It is not the reason why the Solo cycles (at least, not mine). This might be a reason why a sensor is...

If every radiator had a thermostatic valve and all were satisfied before the room stat, the effect would be no different to turning the pump off (unless the 3 way valve allows sufficient to leak through the HW circuit). I have to accept that people at the sharp end of boiler design know what...

Thankyou

That is why it has a safety sensor. If I turn the pump off it boils and trips within a second or two; there's no question of it quietly simmering away under the control sensor.

I presume you are an installer/repairer with minimal design/scientific background? My betting is that keeping the setting sensor on the output side is just a tradition from the days when one sensor doubled as protection and sensing. Moving the sensor would not change the ability to set the...

The load can vary between all radiators plus hot water cylinder, to some radiators with others turned off by thermostatic taps, to the water cylinder on its own. On top of that, a high output is needed for a quick response, then when temperature is established, a low level to maintain it...

I've got one of these and it has always annoyed me to hear it constantly clunking on and off every few seconds. It's very poor design of the electronics. Basically, when it's up to temperature and is putting more heat into the water than can escape, it starts rapid cycling. This is inevitable...

I have looked at it in more detail now and it's obviously just a simple logic change. If a Siemens 322 has the same colours as the L&G322 in my comparison system, it looks as though white goes directly to the demand side of the room stat and grey to pin 13 of the relay box (or even, directly to...

I have a Sunvic DM5601 actuator on top of a valve that has siezed and after turning it with pliers is now leaking. I notice that this is driven to each position, rather than returning by spring. Obviously I need to replace the whole thing. So the question is, does it make any difference...

In the end, the pipework worked out best by fitting the pump on a tray just above the HWC. I didn't add a separate flange from the HWC but vented the outlet before the pump take off. The Bristan pump works nicely and has a volume control which I didn't expect.

No bad experience but we seem to be at cross purposes.

I'm not a plumber either. Making neat soldered joints with copper is very satisfying. Depends on how big the job is but if you start with solder ring, end feeds are more economical when you have more confidence.

Oh, I certainly believe you. Doesn't make it right if there is a manufacturing fault and failure would have happened no matter how installed. I expect they rely on few customers going to the trouble of having the thing expertly examined.

[/url] Exactly my question in my "Shower pump head" thread. The physics says it must be the water level. If a manufacturer says "from the bottom of the tank" for a deliberate reason, they are not talking about water pressure. I found this in my searches:-...

Thanks. Confirms my thoughts. This is nonsense (if they try to wriggle out, not an insult to you). Failure due to incorrect installation would be easy to distinguish from faulty manufacture.